WO2007023046A1 - Ensemble comprenant un actionneur piezoelectrique - Google Patents

Ensemble comprenant un actionneur piezoelectrique Download PDF

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Publication number
WO2007023046A1
WO2007023046A1 PCT/EP2006/064481 EP2006064481W WO2007023046A1 WO 2007023046 A1 WO2007023046 A1 WO 2007023046A1 EP 2006064481 W EP2006064481 W EP 2006064481W WO 2007023046 A1 WO2007023046 A1 WO 2007023046A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement according
piezoelectric element
piezoelectric
actuator
lines
Prior art date
Application number
PCT/EP2006/064481
Other languages
German (de)
English (en)
Inventor
Rudolf Heinz
Dieter Kienzler
Udo Schaich
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to DE502006002906T priority Critical patent/DE502006002906D1/de
Priority to EP06777875A priority patent/EP1920476B1/fr
Publication of WO2007023046A1 publication Critical patent/WO2007023046A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
    • H10N30/875—Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure

Definitions

  • the invention relates to an arrangement with a piezoelectric actuator, for example as a piezoelectric injector or for actuating a mechanical component such as a valve or the like, with an electrical connection for the control of the piezoelectric element via a foot of the piezoelectric actuator according to the generic features of the main claim.
  • a piezoelectric actuator for example as a piezoelectric injector or for actuating a mechanical component such as a valve or the like, with an electrical connection for the control of the piezoelectric element via a foot of the piezoelectric actuator according to the generic features of the main claim.
  • a piezoelectric element can be used so that by utilizing the so-called piezoelectric effect, a control of the needle stroke of a valve or the like can be made.
  • the piezoelectric element is constructed of a material having a suitable crystal structure such that when an external electrical voltage is applied, a mechanical reaction of the piezoelectric element takes place which, depending on the crystal structure and the contact areas of the electrical voltage, represents a pressure or tension in a predeterminable direction.
  • Such piezoelectric actuators are suitable, for example, for applications in which lifting movements take place under high operating forces and high clock frequencies.
  • such a piezoelectric actuator is known from DE 100 26 005 A1, which can be used to control the nozzle needle in piezo injectors for injecting fuel into the combustion chamber of an internal combustion engine.
  • a piezoelectric element constructed as a stack of several electrically coupled together piezoceramic layers, which is held under bias between two stops. Each piezoceramic layer is enclosed as a piezoelectric layer between two internal electrodes via which an electrical voltage can be applied from the outside. Because of this electrical voltage, the piezoceramic layers then each carry out small strokes in the direction of the potential gradient, which add up to the total stroke of the piezoelectric actuator. This total stroke is variable by the amount of voltage applied and can be transferred to a mechanical actuator.
  • EP 1 174 615 A3 also describes a piezoactuator in which a piezoelectric element is present as an actuator module for the direct needle lifting control of an injection injector for an internal combustion engine. Between the piezo element as an actuator and the needle sits only a coupler with a hydraulic ratio to the expansion compensation. With an activation of the piezoelectric element in this case the held under bias to the closure of the injection nozzle needle is moved away from the nozzle opening, as the needle directly translated follows the movement of the actuator.
  • the electrical connection of the piezoelectric element to an external voltage source is carried out by an extension of the outer electrodes through a foot portion of the piezoelectric actuator.
  • This extension can also be routed to a connector, so that they are thus contacted in a mechanically non-critical area.
  • the extensions can thereby be electrically isolated by the actuator base, for example made of steel, on which the piezoelectric element is applied or fixed.
  • the extensions for fixing and strain relief of the outer electrodes are held in a potting compound, which are in a recess of the actuator base, possibly surrounded by a molded part made of steel or polymer introduced.
  • the invention is based on a piezoelectric actuator described above, which has a multilayer structure of piezoelectric layers, which are held as a piezo element in a holding body, wherein the piezoelectric element is a mutual contacting of internal electrodes with contact elements. Furthermore, an actuator foot between the piezoelectric element and the wall of an inner recess of the holding body is present, are guided by the electrical lines to the contact elements.
  • Aktorfuß advantageously formed from a tether on the holder body and a ceramic part in the direction of the piezoelectric element. Such an arrangement is for example advantageously used for controlling the stroke of a needle for fuel injection in a motor vehicle, both with a single-stage and with a two-stage translation.
  • any number of electrical conductors, but usually two lines, or the necessary feedthroughs, in the high-pressure-tight ceramic in parallel and at any angle, even to each other, can be arranged.
  • the ceramic part makes it possible to guide uninsulated electrical conductors, which can be soldered, glued or glass melted directly in the ceramic high pressure-tight.
  • the electrically insulating property of the ceramic leakage currents between the conductors and the metallic components of the injector are excluded.
  • the erfindunbe actuator base can be connected directly to the holding body or with other arbitrary change parts on the Anbindeteil by means of soldering, welding or fittings.
  • the Anbindeteil and the ceramic part can be connected to each other by means of active soldering or glass bonding high pressure tight.
  • the Anbindeteil of metal and the lines are through a Insulation in tying part out.
  • the tether can also consist of a coated or non-metallic as needed material.
  • the shape and the material of the Anbindeteils are freely selectable depending on the application, they need only be high pressure tight connectable to the ceramic part.
  • the contours of the joints between the ceramic part and the tether may also be freely designed depending on the material, strength requirements or required positional accuracy, e.g. with plan or guide grooves and with a corresponding outer diameter pass.
  • the ceramic of a sintered body as a ceramic part is in its molecular structure in itself high pressure tight and takes the electrical contacts isolated, for example, melted by glass, glued or can be introduced high pressure tight directly in the ceramic active soldering under protective gas.
  • glass melts mixed in the ceramic glass content supports the strength and tightness of the connection between the Glass molecules of glass and ceramics.
  • the glass jacket therefore does not have to be so strongly formed in comparison to conventional glass melts.
  • the ceramic mainly takes care of the electrical insulation of the lines to each other, as well as the electrical insulation to the outside of the injector or the internal combustion engine.
  • the outer metal support rings can be dispensed with compared to the usual high-pressure glass fuses, which for reasons of strength limit the max. Diameter factor of 1, 4 of the max. Glass diameter need and thus greatly increase the space requirement. Minimum lengths of the manufacturers also need not be taken into account structurally on the injector. This space is often not available in modern designs, especially when multiple lines in small spaces must be side by side and sealed. At the same time, minimum distances with respect to electrical leakage currents must be maintained in the known arrangements, so that further restrictions in the design of the components are given, for example, if angular arrangements of the glass melts are provided.
  • the aforementioned limitations can be removed, since the components can be made more flexible, for example, in the management of electrical lines and the requirements of the design of the tether.
  • the choice of materials in the Glaseinschmelzrea in steel is very limited, since the strength of the steels by the high process temperatures of about 1000 0 C decreases sharply.
  • soldering for example, active soldering or gluing, or for example with a glass adhesive different combinations of materials can be generated and connected to each other in the invention, without the usually metallic attachment parts by the high sintering temperatures during Glaseinschmelzrata their strength to lose.
  • FIG. 1 shows a longitudinal section through a conventional single-stage piezoelectric actuator for controlling a nozzle needle in fuel injection systems to explain the basic structure
  • FIG. 2 shows a partial section through an actuator base with an electrical contacting of external electrodes of the piezoelectric element in a piezoelectric actuator according to the figure 1 as prior art
  • 3a and 3b shows a partial section and a cross section through an embodiment according to the invention of the implementation of the electrical contacting by the actuator foot to external contact elements for the internal electrodes of the piezoelectric element
  • 4a and 4b shows a partial section and a cross section through an inventive embodiment of the implementation of the electrical contact by the actuator base in a modification to the figures 3a and 3b with conical holes,
  • Figure 5a and 5b shows a partial section and a cross section through a second embodiment according to the invention of the implementation of the electrical contact by the actuator base to internal contact elements with angled wiring and
  • 6a and 6b shows a partial section and a cross section through a second embodiment according to the invention of the implementation of the electrical contact by the actuator base to internal contact elements with straight line.
  • FIG. 1 shows a basic structure of an arrangement with a single-stage piezoelectric actuator 1 is shown, which can be used for example for Nadelhub horrung in the injection system for fuel in an internal combustion engine.
  • a holding body 2 In the upper part of a holding body 2 is present, which can be adapted in its geometric dimensions substantially to the specific site. It can be seen a plug part 3, through which the electrical voltage for the control of a piezoelectric element 5 can be connected with a likewise adapted specifically to the application plug design.
  • the leadership of the electrical line and a possible supply of the controllable with the piezoelectric actuator 1 fuel in the holding body 2 is not visible in this case and not essential for the function of the invention.
  • the piezoelectric element 5 In an inner space 4 of the piezoelectric actuator 1, the piezoelectric element 5 is arranged, which acts on a nozzle needle 7 when actuated via a here below vertically located mechanical arrangement with a coupler 6, that here a release of a nozzle opening 8 can take place. A guided in the interior of the piezoelectric actuator 1 through the interior 4 fuel can thus be injected into the combustion chamber of an internal combustion engine, not shown here.
  • the piezoelectric element 5 is according to the figure 1 via an actuator base 9 on top of a spherical sealing seat in the interior 4, wherein the piezoelectric element 5 is pressed to effect a good sealing seat with a spring 10.
  • a high-pressure seal to an electrical connection space 11 is necessary here, through which two electrical lines 12 and 13, schematically indicated here, are led to the piezoelectric element 5. From FIG. 2, such an arrangement, already known from the prior art DE 100 26 005 A1, of the electrical lines 12 and 13 located in a casting compound can be seen in the actuator base 9.
  • the piezoelectric layers stacked one above the other which are constructed of ceramic piezoelectric films with a suitable crystal structure, so that taking advantage of the so-called piezoelectric effect in the manner described in the introduction of an external electrical voltage to here only exemplified with reference numerals inner electrodes 14 and 15, a mechanical reaction of the piezoelectric element 5 in the direction of the stack structure.
  • the supply of the different poles of the electrical voltage takes place in each case from one side over outer contact elements 16 and 17, which are each guided via external contact surfaces 18 and 19 mutually to the inner electrodes 14 and 15 of the respective piezoelectric layer.
  • Figure 3a and 3b shows an embodiment of a guide of the lines 12 and 13 for the electrical contacts in the piezoelectric actuator 1 by an actuator foot 20 according to the invention and Figure 4 shows a plan view.
  • the Aktorfuß 20 consists of an electrically insulating ceramic part 21 and a Anbindeteil 22 made of metal, for example steel or non-ferrous metal, the tether 22 can be added for example via solder joints 23 to the support body 2 and between the Anbindeteil 22 and the ceramic part 21 a Connection via active soldering or by means of a glass bond can be made.
  • the ceramic part 21 rests on the piezoelectric element 5.
  • the lines 12 and 13 are each in a recess 24 which can be filled with solder during soldering and the line 12 and 13 of Figures 4a and 4b are each in an upwardly tapered bore 25 in a glass melting can be made.
  • insulations 26 are provided here.
  • the connection with the outer contacts of the piezoelectric element 5 takes place in the same manner as in the prior art according to FIG. 2.
  • FIGS. 5a and 6a each show a further embodiment of a guide of the leads 12 and 13 for the electrical contacts in the piezoelectric actuator 1 by an actuator foot 30 according to the invention and FIGS. 5b and 6b each show a plan view.
  • an internal contacting of internal electrodes in the piezoelectric element 5 is carried out here in two variants.
  • the actuator base 30 also consists of an electrically insulating ceramic part 31 and a tether 32 made of metal, for example steel or non-ferrous metal, which can be interconnected as in the embodiment described above.
  • the attachment part 32 can be attached to the holding body 2 by means of a passport or guide pin 33 and a screw thread 34.
  • 6b are still recesses 35 for indexing, key areas or contours for additional Aktorisoltechniken available.
  • the line 12 and 13 of Figures 5a and 5b are guided by an insulation 36 in the tether 32 and then in the ceramic part 31 slightly angled here.
  • the lines 12 and 13 are here held in the ceramic part 31 and can then be connected in each case via a plug connection 38 with the contact elements 39 for the internal contacting of the internal electrodes 14 and 15.
  • the arrangement according to the invention is advantageously used, for example, industrially for controlling the stroke of a needle for fuel injection in a motor vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

L'invention concerne un ensemble comprenant un actionneur piézoélectrique, par exemple sous la forme d'un injecteur piézoélectrique ou pour actionner un composant mécanique. Cet ensemble comprend une structure multicouche constituée de couches piézoélectriques qui sont maintenues sous la forme d'un élément piézoélectrique (5) dans un corps de retenue (2), cet élément piézoélectrique (5) présentant une mise en contact mutuelle d'électrodes intérieures (14, 15) avec des éléments de contact (16, 17 ; 39, 42). L'ensemble selon l'invention comprend par ailleurs une base d'actionneur (9 ; 21, 22 ; 31, 32) entre l'élément piézoélectrique (5) et la paroi d'un évidement intérieur (4) du corps de retenue (2), des lignes (12, 13) électriques reliées aux éléments de contact (16, 17 ; 39, 42) passant à travers cette base. Ladite base d'actionneur est constituée d'une partie de liaison (22 ; 32) reliée au corps de retenue (2) et d'une partie en céramique (21 ; 31) orientée vers l'élément piézoélectrique (5).
PCT/EP2006/064481 2005-08-24 2006-07-21 Ensemble comprenant un actionneur piezoelectrique WO2007023046A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE502006002906T DE502006002906D1 (de) 2005-08-24 2006-07-21 Anordnung mit einem piezoaktor
EP06777875A EP1920476B1 (fr) 2005-08-24 2006-07-21 Ensemble comprenant un actionneur piezoelectrique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005039911A DE102005039911A1 (de) 2005-08-24 2005-08-24 Anordnung mit einem Piezoaktor
DE102005039911.8 2005-08-24

Publications (1)

Publication Number Publication Date
WO2007023046A1 true WO2007023046A1 (fr) 2007-03-01

Family

ID=36950478

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/064481 WO2007023046A1 (fr) 2005-08-24 2006-07-21 Ensemble comprenant un actionneur piezoelectrique

Country Status (4)

Country Link
EP (1) EP1920476B1 (fr)
AT (1) ATE423396T1 (fr)
DE (2) DE102005039911A1 (fr)
WO (1) WO2007023046A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1972778A1 (fr) * 2007-03-19 2008-09-24 Robert Bosch GmbH Passages de câbles pour un module de piézoacteur
GB2547660A (en) * 2016-02-24 2017-08-30 Delphi Int Operations Luxembourg Sarl Fuel injector
CN112343349A (zh) * 2020-11-12 2021-02-09 重庆交通大学 压电导管、预应力筋先张折弯装置及预应力筋先张折弯施工方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007045566A1 (de) 2007-09-24 2009-04-02 Robert Bosch Gmbh Dichtgeometrie für Injektoren
DE102008040639A1 (de) 2007-10-04 2009-04-09 Robert Bosch Gmbh Dichtsitz mit Sitzbegrenzung
DE102009034099A1 (de) 2009-07-21 2011-01-27 Epcos Ag Piezoaktor mit elektrischer Kontaktierung
DE102009029213B4 (de) 2009-09-04 2017-03-30 Robert Bosch Gmbh Anordnung mit einem Aktor
DE102009029627A1 (de) 2009-09-21 2011-03-24 Robert Bosch Gmbh Anordnung mit einem Aktor
DE102015211937A1 (de) * 2015-06-26 2016-12-29 Robert Bosch Gmbh Piezoaktormodul, Verfahren zum Herstellen eines Piezoaktormoduls und Piezoinjektor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753930A1 (de) * 1997-12-05 1999-06-10 Ceramtec Ag Verfahren zur Anbringung von Außenelektroden an Festkörperaktoren
DE10026005A1 (de) * 2000-05-25 2001-12-06 Bosch Gmbh Robert Piezoaktor
DE10046661A1 (de) * 2000-09-20 2002-04-04 Bosch Gmbh Robert Piezoaktor
DE10259320A1 (de) * 2002-08-09 2004-02-26 Epcos Ag Druckkontaktiertes elektrisches Bauelement
DE10335019A1 (de) * 2003-07-31 2005-02-17 Robert Bosch Gmbh Piezoaktor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753930A1 (de) * 1997-12-05 1999-06-10 Ceramtec Ag Verfahren zur Anbringung von Außenelektroden an Festkörperaktoren
DE10026005A1 (de) * 2000-05-25 2001-12-06 Bosch Gmbh Robert Piezoaktor
DE10046661A1 (de) * 2000-09-20 2002-04-04 Bosch Gmbh Robert Piezoaktor
DE10259320A1 (de) * 2002-08-09 2004-02-26 Epcos Ag Druckkontaktiertes elektrisches Bauelement
DE10335019A1 (de) * 2003-07-31 2005-02-17 Robert Bosch Gmbh Piezoaktor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1972778A1 (fr) * 2007-03-19 2008-09-24 Robert Bosch GmbH Passages de câbles pour un module de piézoacteur
GB2547660A (en) * 2016-02-24 2017-08-30 Delphi Int Operations Luxembourg Sarl Fuel injector
CN112343349A (zh) * 2020-11-12 2021-02-09 重庆交通大学 压电导管、预应力筋先张折弯装置及预应力筋先张折弯施工方法

Also Published As

Publication number Publication date
EP1920476B1 (fr) 2009-02-18
DE502006002906D1 (de) 2009-04-02
EP1920476A1 (fr) 2008-05-14
DE102005039911A1 (de) 2007-03-08
ATE423396T1 (de) 2009-03-15

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